𝔖 Bobbio Scriptorium
✦   LIBER   ✦

1H-NMR-untersuchungen an sialinsäuren markierung von N-acetyl-D-neuraminsäure mit deuterium

✍ Scribed by Horst Friebolin; Hermann Schmidt; Martin Supp


Publisher
Elsevier Science
Year
1981
Tongue
French
Weight
235 KB
Volume
22
Category
Article
ISSN
0040-4039

No coin nor oath required. For personal study only.

✦ Synopsis


An efficient method for the deuteration of N-acetyl-D-neuraninicacid (NeuAc) at C-3 is described. In alkaline D20 solution both protons of NeuAc (H3a and H3e) will be substituted by deuterium, whereby the substitution effect was found to be faster for H3a than for H3e . The rate of this exchange depends strongly on the pD value: the rate increases with increasing pD value. In acidic solution no effect could be observed. The process of H-D-exchange


📜 SIMILAR VOLUMES


1H-NMR-Untersuchungen zur Mutarotation d
✍ Prof. Dr. Horst Friebolin; Dr. Martin Supp; Prof. Dr. Reinhard Brossmer; Dr. Gun 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 236 KB 👁 1 views

Reaktion a: (3) wurde nach Vogel et al.1'-31 rnit n-Butyllithium in die Dilithiumverbindung (wasserfreier Et20, -20 bis O"C, N,) umgewandelt, aus der sich durch Metallaustausch rnit wasserfreiem MgBr2 die bifunktionelle Grignard-Verbindung gewinnen lien. Setzte man diese bei 0 °C mit frisch bereitet

1H-NMR-Spektroskopische untersuchungen z
✍ H. Friebolin; P. Kunzelmann; M. Supp; R. Brossmer; G. Keilich; D. Ziegler 📂 Article 📅 1981 🏛 Elsevier Science 🌐 French ⚖ 214 KB

The pD-dependence of the mutarotation of N-acetyl-D-neuraminic acid was studied by 'H-nmr spectroscopy. The rate constant has a minimum at pD 5.4. At pD 1.3 and pD 11.7 the establishment of the equilibrium of mutarotation was found to be so fast, that it cannot be measured.